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So if I'm using 410mm for the Y extrusion length and 420mm for the X extrusion, the lengths you have listed should be OK shouldn't they (as the 405 rail would have 410mm of space and the 470 rail would have the space from the 420 extrusion plus the 30mm on either side from the Y frames, making the available space 480mm in total). Does that all sound about right?